Not quite right. There are USB erupters going for 0.12 each.
Source:
https://bitcointalk.org/index.php?topic=298435.0 (0.125)
https://bitcointalk.org/index.php?topic=294977.0 (0.12)
Asic: 10.752GHash/s blade 3.5 BTC:
https://bitcointalk.org/index.php?topic=294978.0My Math puts it at:
3.5ea@10.752 GH.
400/10.752=37.20*3.5= 130 BTC.
400/0.330=1212.1212*0.12=145.45 BTC
So yes your unit is 90 BTC < 130 BTC.
But not much more then 90, as difficulty increases 20-30% weekly.
By the time this unit is hashing difficulty will already have increase probably about 50% or so.
Take that into account and that 130 BTC is like 65 BTC.
If the person had this unit TODAY, or within a few days. Then I see a value of 90-110 BTC or so.
You can get these asic blades and asic erupters like in a few days, VS a few weeks.
And time is of essence atm.
Also forgetting 400 GH of asic blade costing 130 BTC would generate a few BTC within 2-3 weeks
before a user got this 400 GH unit from your auction.
About ฿1.79 Atm Daily now. So that would generate about 1.79*21=37.59 BTC
Now accounting for difficulty probably closer to 25 BTC.
130-25 BTC = 105 BTC. So its par with this auction, only if KNCminer ships within 21 days. If they
ship a month late, well bad luck to the buyer. Basically one option risky, one safer.